Improved machine for making tin-lined lead pipe



y .and only movable with'the cylinder a.

STATES `PATENT Trice,

S. E. CHUBBUCK AND J. H. GHADVVIGK, OF BOSTON, MASSACHUSETTS, ASSIGNORS TO J. H. CHADWICK.

IMPROVED MACHINE FOR .MAKING TIN-LINED LEAD PIPlE.

Specification forming part of Letters Patent No. 79,54i9, dated July 7, 1868.

To all whom it may concern Be it known that we, S. E. GHUBBUCK and J. H. CHADWIGK, both of Boston, in the county of Sutt'olk and State ot' Massachusetts, have invented certain Improvements in Machinery for Making Compound Pipe; and we do hereby declare that the following` is a full and eX- act description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

With reference to the accompanying drawin gs, Figure lis a sectional view ot' those parts of a machine to which our improvements relate. Fig. 2 is a similar sectional view, the metal for the exterior portion of the pipe being shown in the cylinder and the casing drawn up preparatory to the introduction oi' the metal for the interior or lining of the pipe. Fig. 3 shows a section of the same parts as they appear during the process of pressing and forming the compound pipe. Fig. et is a section taken at line A; Fig. 5, a section at line B.

In Fig. 1, a is a cylinder to receive the metal to be converted into pipe. b is the follower or ram. surface ofthe pipe, and which is connected to n is the die which forms the exterior surface of the pipe.

lncasing the mandrel c is a casing, cl, movable outward and inward through the follower b. A gear-wheel and crank, cf, and rack g, or any other suitable mechanismsuch -as hydraulic press or otherwise-is applied to the casing d, by which it may be drawn out, as shown in Fig. 2, or forced in, as shown in Fig. 1. A stop, h, is furnished, against which a "shoulder in casing cl rests when drawn out, as in Fig. 2, in which position the casing becomes a partof the follower or ram b, operating in harmony with it.

The operation of the machinery is as follows: The parts being in the position shown in Fig. 1, the metalfor theexterior of thepipe is poured in a fused state into the cylinder a, and forms around casing d. The casing cl is then'drawn but, leaving the metal as represented in Fig. 2. The metal for the interior ot' the pipe is then poured in a fusedl or melted condition lnto'space t', (see Fig. 2,) filling it, after which hydraulic or other pressure is applied, as by a c is the mandrel which forms the inner press,j, the follower or ram b being held stationary or the pressure may be applied to the ram I) and the cylinder be held stationary. In either case the metals occupying the proper proportionate annular space within the cylinder are made to pass out in similarly-proportionate quantity, and consequentlyin similarlyproportionate thickness, through the die n and around mandrel c, in proper com pound-pipe form, as shown in Fig. 3.

It will be observed that if more than two component metals 'are to be used the case d should have one, two, or more cases in succession, incasing it and each other as it does the mandrel c, and one after another should be drawn out for the introduction ol one metal after another in like manner, when they in like manner, forming a part of the ram, operate together in like manner in thc pressing operation.

It will be observed that a considerable advantage is gained in the provision made by this improvement for the introduction of the outer metal (which is ordinarily the grosser, and requires the higher temperature to melt) first in order, and afterward the lining'metal in a sufficiently hot state to properly adhere or weld to the other, if desired, without the danger of the two mixing too much, which otherwise might occur. v

It is also an advantage which this improvement affords to be able to introduce under so convenient an arrangement the several metals in a fused or melted state, While the pipe produced is certain to conform in the proportionate thickness and the distinctness of its several component materials to the'proportions represented by the casing or enlarged prolongation d in the one part and the space around it and within the cylinder in the other.

The-parts should be made of such materials as are commonly employed in the-art, such as steel, iron, and other metals which recommend themselves to those conversant with the art.

We do not claim a cylinder, ram, or mandrel of themselves separately, no r the same as a combination, for both these devices and their combination are old and well known; nor do we claim the casing or sheath as a means simply of preventing the lead, when poured, from coming in contact with the tin, for this is accomplished in the machine patented to John ing` casing el withthe ram, cylinder, and die, Farrell, Februar;7 25, 1868, in which a sheath when all are arranged relative one to the other s used to protect the tin from the injurious as and so as to operate in the manner deeft'ects of the hot lead but which, after the lead scribed. has been poured, is entirely removed from the machine, thus leaving a void space between S E' CHUBBUOK the two ingots, and the latterto that extent J' H' OHADWIGK' unsupported; but Witnesses:

What We do claim is- J. T. ELLIS,

The combination of the annular reciprocat- J. W. KEITH. 

